“It was 25 years ago that Microsoft Solitaire debuted on Windows, and to honor the decades of fun it’s given us all, we’re celebrating with two big competitions. First, an internal competition among Microsoft employees kicks off today to determine who leads the leaderboards here. Then, in early June, the same challenges used in the tournament will be released in the game for the world to play” read the blog post of tech giant Microsoft. Microsoft’s solitaire program for Windows was the world’s biggest productivity killer. The program sol.exe was created back in 1990 with the release of Windows 3.0, and since then it’s been included in every version of Windows except for Windows 8 and 8.1.

The tournament will be held in two stages. The first will feature only Microsoft employees so that they may select the best amongst themselves who in turn will then battle it out against the general public starting on June 5.